SCR Desulfurization and Denitrification Equipment for Reheating Furnace in Steel Rolling Mill

    SCR Desulfurization and Denitrification Equipment for Rolling Mill Heating Furnace

    The SCR desulfurization and denitrification equipment for rolling mill heating furnaces typically adopts a combined process of "medium-high temperature SCR denitrification + SDS dry desulfurization + bag filter." The following analysis covers equipment principles, process flow, equipment selection, and operational advantages:

    Equipment Principles and Process Flow

1. SCR Denitrification:
   • Principle: Under specific temperature and catalytic conditions, a reducing agent (such as ammonia) is used to reduce nitrogen oxides (NOx) in the flue gas into nitrogen and water.
   • Process: The flue gas temperature from the heating furnace ranges between 90-150°C. A medium-high temperature catalyst suitable for heating furnace flue gas is employed. Gaseous ammonia is injected at the appropriate flue gas temperature to react with NOx, achieving denitrification. This process also effectively avoids the formation of ammonium bisulfate, reducing equipment scaling and clogging.
2. SDS Dry Desulfurization:
   • Principle: Ground baking soda powder is injected into the flue gas, where it rapidly decomposes and expands, increasing its specific surface area and activity, thereby enhancing desulfurization efficiency.
   • Process: No wastewater is generated after desulfurization. The desulfurization ash is carried by the flue gas and collected by the bag filter. This process offers advantages such as energy savings, low operating costs, and minimal solid waste production, making it suitable for flue gas desulfurization in heating furnaces.
3. Bag Filter:
   • Principle: Uses filter bags to capture dust particles in the flue gas.
   • Process: Considering the dust characteristics after desulfurization of heating furnace flue gas, a straight-through pulse bag filter is selected. It features high purification efficiency, low equipment resistance, and a long filter bag lifespan.
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  Key Points for Equipment Selection

1. Dust Characteristics: Consider the specific gravity, quantity, and humidity of the dust to select equipment with appropriate power and capacity. For dust with high humidity, avoid dry-type equipment.
2. Usage Frequency and Duration: Based on the equipment's usage frequency and operating hours, choose equipment capable of continuous 24-hour operation.
3. Working Environment: Assess the cleanliness level of the environment to determine whether a dust-free room-specific dust collector is necessary.
4. Safety Requirements: For flammable and explosive working conditions, evaluate the safety level to decide if explosion-proof equipment is required.